100hp.outboard no top end power

[vpmurphy]

I have a 1979 100 hp evinrude that had been running pretty good. I went out the other morning ran a wot for approx. ten minutes and every once in a while the engine seemed to rev. just a little higher for maybe half of a second or so. I started to come home after my day fishing and I could not achieve full throttle even though the control was all the forward? The engine is starting and idling just fine. I pull the boat out a checked all linkages an all are fine. Ran it with flush kit and it achieved full throttle no problem but no load on engine? Any body experience similar problem? problem?

 

[oklakerat]

Re: 100hp.outboard no top end power

New to board, but had your experience on my 1979 85 HP Johnson. I assume by full throttle you mean full rpm. I was running 4600 rpm out one day, and on way in could only achieve 3300 rpm. To my surprise, I had lost a power pack and was running on two cylinders. I didn't think the engine would work that well on two cylinders, but it did. When at dock, I could achieve rpm, but my idle was down slightly from usual. I noticed two cylinders were cold, pulled spark plugs to check spark, and only had two firing. Replaced power pack and problem was solved. Now I keep a spare on board.